what is unipolar pam

[jitender]

Basically i want to knw the corresponding waveform of unipolar PAM.I wud be extremely greatful for u.

Jitender

[prateeksikka]

hi jitender!
if i am not mistaken u are talking about pulse amplitute modulation.The amplitude of same ,symmetrical pulses is varied in accordance with modulating signal.just like AM .but it is pulses as carrier rather than a sinusoid.
;D

[walid]

Read this pdf file I hope it will help u:

www.comlab.hut.fi/opetus/245/2004/07_digibaseb.ppt

[ante]

Hi guys,

This is not a PDF file it’s a PPT file, you need Microsoft Power Point to view this file! ;)

[audioguru]

I worked with a huge intercom system that multiplexed many conversations and background music internally along a single wire using PAM. The instantaneous amplitude of each conversation was sampled in its time-slot then a sample-and-hold stage held it until the multiplexer came around again to its time slot for the next sample. Of course, the multiplexer operated at a very high frequency. After being decoded in its time slot and filtering, it sounded nearly perfect.
I had to soup-it-up so it met the strict "broadcast quality" spec's for the PA at international airports. Nearly CD quality sound. ;D

[prateeksikka]

hi audioguru!
i guess we hardly use PAM for digital modulation i guess PTM has more advantages.
and know one thing,i just came to know that there is a fallacy in the name itself of PCM(it is not a modulation scheme)!
cheers!